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Wrong MAC Address on ARP

Gerard-Philippe Guminski2

Hello,

if i do a arp request from internal Network to a device behind a Red15 (Standard/Unified) i get the MAC of the SG/UTM not of the device behind the RED.

Whats wrong here?

Best Regards

Phill



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  • 0

    That#s correct.

    behind a routing instance (layer3-border) you see the MAC of the router (gateway) which should forward the packet.

    The device-MAC you see only within the same L2 network.

    if you ping from UTM, you see the client-mac at the UTM.


    Dirk

    Systema Gesellschaft für angewandte Datentechnik mbH  // Sophos Platinum Partner
    Sophos Solution Partner since 2003
    If a post solves your question, click the 'Verify Answer' link at this post.

Reply
  • 0

    That#s correct.

    behind a routing instance (layer3-border) you see the MAC of the router (gateway) which should forward the packet.

    The device-MAC you see only within the same L2 network.

    if you ping from UTM, you see the client-mac at the UTM.


    Dirk

    Systema Gesellschaft für angewandte Datentechnik mbH  // Sophos Platinum Partner
    Sophos Solution Partner since 2003
    If a post solves your question, click the 'Verify Answer' link at this post.

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